Steam-boilek



my invention.

IINITED STATES PATENT OFFICE.

SMITH BALDVIN, OF ST. LOUIS, MISSOURI.

STEAM-BOILER.

Specification of Letters Patent No. 16,959, dated April 7, 1857.

To all whom 'it may concern: Y y

Be it known that I, SMITH BALDWIN, of the city of St. Louis and State of Missouri, have invented a new and useful Improvement in Steam-Boilers; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, in which` Figure l is a central longitudinal vertical section of a boiler constructed according to Fig. 2, is a transverse vertical section of the same7 in the line a?, of Fig. il, looking in the direction of the arrow 8, or toward the front of the boiler.

Similar letters of reference indicate corresponding parts in both figures.

This invention consists in a novel arrangement of water-spaces, water tubes, lire surface and iues, whereby a very extensive heating surface is obtained covered with a small body of water and at the same time a perfect circulation of water is provided for,

making a boiler that is at the lsame timev safe, durable and economical.

To enable others to make and use my invention, I will proceed to describe its construction and `operation.`

a, is a horizontal cylinder constituting the external shell of the boiler.

o, is an inner cylinder of smaller diameter and shorter than a, arranged concentrically with it so as to provide for a circulation all around the inner cylinder and between the heads o, c, of the inner and the heads j, f1, of the outer cylinder. The heads c, c, of the inner cylinder b, are tube sheets to receive a number of horizontal water tubes d, d, which form a means ofcommunication from one to the other of the two water spaces c, e, between the heads of the two cylinders, and for the circulation of the water.

A, is the lire place, and B, is the grate, the latter being at about the level of the bottom of the inner cylinder Z2, which, as well as the outer cylinder, has a piece cut out of its bottom, in the form of the line y, g, g, shown in Fig. 2, to form the re place and make a communication therefrom to the interior of the cylinder b. The lower front parts of the cylinders where they are cut away to make the fire place is closed by plates in the line 7L, z', Fig. l.

j, j, are flues of which there may be any number, connected by elbows lo, 7c, with the sides and top of the cylinder 6 near the rear end thereof and running forward horizontally through the annular water space Z, between the cylinders a, o, and passing through the front head f1, of the outer cylinder a, into a hollow arched Hue mi, in front of the boiler.

n, is a horizontal flue running from the top of the arched flue m, over the top of the cylinder a, through the steam chamber p, which is above the said cylinder, to an upright chimney g, at the rear of the boiler. The proper water level is about even with the top of the outer cylinder a.

The operation of the boiler is as follows: The lire on the grate B, acts by radiation on a large portion of the exterior of the tubes d, fl, and the gaseous products of combustion circulate among and around the said tubes and around the interiorof the cylinder b, which, with the exterior of the tubes, is all heating surface and from thence escape through the elbows 7c, lc, and flues j, j, which are all heat-ing surfaces, into the arched flue m, and from thence though the flue n, (which, passing through the steam chamber, dries the steam) to the chimney g.

The chimney g, is continued downward as shown in Fig. l, to form a flue r, communicating with a horizontal flue s, passing through t-he bottom of the water space Z, to the ash-pit, for the purpose, if desired, of returning the gaseous products of combustion, or a portion thereof, by way of the ash pit u, through the fire, to be consumed but this arrangement of flues can be shut olf by a damper t, when it is not desired to use it.

What I claim as my invention, and desire to secure by Letters Patent, is:

rIhe arrangement of the cylinders a, o, the water tubes d, d, flues y', j, m, and n, in the manner substantially as herein described, to operate as herein set forth.

SMITH BALDWIN.

Witnesses `W. TUsoH, WM. I-IAUFF. 

